Keiji is a former policeman. However he lies and tells everyone he's still a policeman. He shot his mentor once on the job after being told he was  criminal, and hasn't been able to pick up a gun since. He has extreme trauma from that. Keiji is a fatherly figure to people like Sara and Gin. He's very logical and level headed unless his past is brought up, then he gets angry. He's very playfully flirty but rarely gets romantically attached.  He has commitment issues. Keiji is very strong.